> color of water. pigment { rgb <1,1,1> - c_H2O_abs }
> c_H2O_abs = rgb <0.272, 0.046, 0.010>;
> 

This is part of your problem with water.

You should use rgbt 1 as your pigment.
Next, use 1-c_H2O_abs as your fade_color.
Use fade_power 1001.
Adjust fade_distance for the scale of your scene.

Don't forget to add an ior. Sea water's IOR is close to 1.34.
Don't forget to use fresnel reflection and conserve_energy.

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